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J. R. FINNEY.

ELEOTRIIG ARC LAMP. No. 275,182. Patented Apr. 3.11883.

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fiwwzzrg UNITED STATES PATENT OFFICE.

JOSEPH R. FINNEY, OF PITTSBURG, PA., ASSIGNOl-t TO THE FINNEY ELEG- TRIG LIGHT AND TELEGRAPH COMPANY, (LIMITED,) OF SAME PLACE.

ELECTRIC-ARC LAMP.

SPECIFICATION forming part of Letters Patent No. 275,182, dated April 3, 1888.

Application filed October 24,

To all whom it may concern:

Be it known that I, JOSEPH R. FINNEY, of Pittsburg, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvementin Electric-ArcLamps; and I do hereby declare the following to be a full, clear, and exact description thereof, reference being bad to the accompanying draw ings, forming a part of this specification, in which- Figure 1 is an elevation of my improved electric-arc lamp, partly in section. Fig. 2 is a detached view of the carbon-feed-rod holder. Fig. 3 is an edge view. Fig. 4 is a view of a modified form.

Like letters of reference indicate like partsin each.

The lamp-frame is composed of two side bars, a a, and two cross-heads, b b. The side bars are secured to the cross-heads by means of nuts 0. The cross-head b is insulated from the arm a by means of a collar, (1, of insulating material, which is provided with flanges which extend between the nuts and the head. The side bar a is insulated from the crosshead I) by the insulating-collar d. Placed around the collar (1 is a ring, 6, of insulating material, to which one of the circuit-wires,p, is attached. Sustained on the cross-head bis an electro-magnct, f, having a core, g, which is bored longitudinally for the passage of the carbon-feed rod'h, the bore being of sufficient size to permit the rod to slide freely through the core. Secured on the under side of the cross-head b is a frame or stirrup, i, which is also bored for the passage of the feed-rod h. Supported on theframe i is a feed-rod holder, [6, which consists of two jaws pivoted together at 7c, and recessed at their lower ends for the passage of the rod. The jaws have arms k, which extend upward, and at their upper ends are fastened to iron armatures l, which project out beyond the lower edges of the core g. The arms have a slight radial movement, which is limited by the stirrup i, and is sut'fioient to enable them to swing outwardly far enough to release the feed-rod when the core gis demagnetized, but not far enough to go beyond the attractive power of the magnet. Thelower carbon is secured in a suitable sock- (Xo model.)

et, D The upper carbon is securedin asocket, 72 on the lower end of the feed-rod h. The head 6 is formed of adiamagnetic metal. The magnetfis formed by wrapping the core with the wire 1), which extends from the ring 6. The end of the wire 1 terminates at the core. The wire a is connected to the rod (0. The current passes by the wire 12, ring 6, wire 1), and rod h to the upper carbon. The connection between the wire a and the lower carbon is through the rod [1. lower cross-head, I), and carbon-holder Ir. hen the circuit is closed the armatures Z on the ends of the arms L are first drawn inward until thejaws 7r bite on the feed-rod h, and then the arinatures are drawn upward to the core 1, raising the rod with the upper carbon and establishing the arc. \Vhen by the burning off of the points the resistance increases the magnetism of the core 9 decreases until the core loses its hold on the armatures, which fall downward and outward and permit the sliding rod to fall until the carbon points come together again. This establishes the circuit,increases the magnetism of the core, draws up the armatures, and by that means raises the rod and again establishes the are.

In Fig. l I show a modification in which the lower jaws, 7:, are done away with, and the holder is caused to bite on the rod at the points k In this case the stirrup i is done away with, and the holder 7; is sustained by means of the screws 0, which extend down from the cross-head a through slots 0 in the armatures. These slots permit the radial movement of the armatures, so as to admit of the jaws k biting on the rod, as described.

My improved lamp is simple and cheap in its construction, requires but little attention to keep itin order, and feeds with great smoothness.

hat I claim as my invention, and desire to secure by Letters Patent, is

1. The combination, in an electrioarc lamp, ot an electro magnet, a cross-jaw, detached gripping device, the outer ends of the jaws being provided with armatures capable of a radial and axial movement, and a bracket for sustaining and limiting the motion of the gripper, substantially as and for thepnrpcse specified.

2. The combination, in an electric-arc lamp, In testimony whereof I havehereunto set my of a vertically-arranged annular electro'lnaghand this 23d day of October, A. D. 1882.

net and a )air of Ti )Jil] aws vivoted to- 1 I i T ,7

gather and armnge a a v ertica l plane bi- JOSEPH FIND 5 secting the magnet, each jaw having a, sepa- Witnesses 1 rate armature fastened to its outer end, sub- V. B. OORWIN,

stantially as and for the purpose specified. T. B. KERR. 

